Composite head for tacks or the like



H. BgrlLToN COMPOSITE HEAD FOR TACKS OR THE LIKE May 5, 1925. 1,536,277

Filed Aug. 30. 1922 F54 m55 E5 2' @El mm1 A EN I n vent o1* HENRY E. TIL TUN Patented May 5, 1925.

UNITED STATES PATENT FFICE.

HENRY B fririron, or ronrsivrourn, new naifrrsnrnn, `assienon 'ro MontarBur- TON MANUFACTURING GOMPANY, 0F BOSTON, MASSACHUSETTS, A CORPORATION.

CMPSITE HEAD FOR 'EALCKS GR 'ITI-IE LIKE.

appueauon sie@ august so, 192e.

To @ZZ 107mm t may conica/fn Be it known that I, l-lnnnr B. Tnfron, a

` citizen of the United States, residing at Portsmouth, county ofRockingham, State of New Hampshire, have invented certain new and usefulImprovements in Composite Heads for Tacks or the like, of which thefollowing is a specification.

rThis invention relates to tack heads and similar articles andparticularly to a headed tack of general usefulness `but particularlywell adapted for electrical work as in the running of wires and thelike. In any such use where a tack head is subjected to rather violenttreatment in driving in all kinds of woods and where it has to bedepended upon to retain one or more strands of wire or other material,and especially where it is subject to considerable variations inmoisture and temperature the problem of providing anything in thecharacter of a reasonably insulated headed fastening is ditlicult.liVithout going into further detail of the exacting requirements or thedifficulties of meeting them, all of which are well known in the trade,I will pass immediately to the discussion of an illustrative embodimentof my invention which I shall show and describe as a composite headedtack of a style employed on telephone work and other electrical work, assuch an embodiment well illustrates the principles involved and is ofitself of immediate commercial value and utility.

Throughout the specification and drawings like reference characters areemployed to indicate corresponding parts, and in the y drawings F ig. lis an enlarged sectie-nal view of a tack in accordance with myinvention.

Fig. 2 a bottom view of such a tack.

Figs. 3 and l a top and edge view of a tack core. y

Fig. 5 a core and tack assembled.

Fig. 6 a similar view with the head formed.

Fig. 7 a plan View of a cover disc.

Fig.` 8 a sectional view of the partly formed cover.

Fig. 9 a sectional view indicating the completion of the covering.

Referring to the embodiment shown in the drawings it will be seen thatthis tack comprises a shank l which may be of any usual style or lengthor gage of wire and a composite head member. This head may have SerialNo. 585,280.

any desired shape or external iinish, but itcomprises a core 2preferably of soft fibrous material and an outer shell or casing 3preferably of a more tough and somewhat ductile fibrous material such asone of the libre or leather boards.

l have endeavoredto illustrate in Fig. l a section through the head ofsuch a tack so as to illustrate its construction and characteristics. Informing such a tack in accordance with my invention I preferably cut asmall blank of the fibrous material such as button board in the form ofa blank 2 as indicated in Figs. and 4e. This blank is very easilypierced by the shank of the tack l as indicated in Fig. 5 and the headblank or core is then brought to approximate shape as indicated at 22,Fig. 6.

I also prepare a blank disc 3 which is died out from flat stock, Fig. 7,and then partially form it into a shell 32, Fig. 8. The blank 3 isconsiderably larger than the diameter of the blank 2 or the formed headcore When drawn or pressed to the formed shell 32 it is still somewhatlarger than the head or head core 22, there being suflicient stock leftin the edges of the cup to be drawn down over the edge of the head core22 and beneath the same.

The partly formed shell 32 may be conveniently drawn about the head core22 as indicated in Fig. 9. In this figure the shell 32 is retainedwithin a female die .A shaped to the ultimate form of the head, and thetack of Fig. 6 is supported in a male die B which is slightly con-cavedat its upper edge, as indicated at B', Fig. 9, to permit the edge of theshell 3? to be turned in under the head 22 and compressed when the diesare brought together.

stand the various atmospheric conditions,

particularly moisture.

In impregnating the head the soft fibrous head core 2 readily takes upsuitable solutions or treatments. These may be of an oily or gummycharacter or both, as for eX- ample, drying oils or oils and gums. Suchtreatment strikes through the brous head core 2 not only impregnating itlout reaching through to the interior of the shell 3 which is thusbrought into firm union with the core 2 While the entire interior ishardened as to its structure and waterproofed.l The coating furtherstrikes in Jrom the exterior so that a comparatively complete degree ofimpregnation oil? the composite head takes place after the tack is madeand the. head mechanically Yformed. The heads may be dried or baked asdesired to hasten or facilitate the setting of the treatment.

Tacls formed With such heads so treated have an unusual degree et'strength and a very high resistance to moisture. They are substantiallynonconductors and may be driven in even the harder Woods Without ruptureof the head or shell and may also be successfully Withdrawn Withoutstripping the head and leaving the sharp tack as a menace to the handsor clothing.

Various modifications may be made in the parts and method of assemblyand in the manner ol: treatnient all without departing from the spiritolf my invention if Within the limits of the appended claim.

W'hat I. therefore claim and desire to secure by Letters Patent is Anarticle of the class described, comprising an absorbent core, afastening member projected through said core, a shell ot' moldablei'ibrous material formed about said core and projecting under the lowerface or' the same, said core and shell being impregnated with a liquidpenetrant dried therein.

in testimony whereof I alli; my signature in presence ol two Witnesses.

HENRY B. TILTON. l/Vitnesses FRED OLDFIELD, HERBERT S. GUPBELL.

